Driving and stopping mechanism



W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2. 1918.

1,355; 59, Patnted Oct. 12,1920.

5 SHEETS-SHEET I.

w. c. MEYER. DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2, I918.

Patented Oct. 12, 1920.

5 SHEETS-SHEET 2- W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2. I918.

' 1,355,159. Patented Oct. 12,1920.

5 SHEETS-SHEET 3.

W. C. MEYER.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED OCT. 2 19I8.

Patented Oct. 12,1920.

5 SHEETS-SHEET 4.

W. C. MEYER.

DRIVING AND STOPPING MECHANISM. APPLICATION FILED ear. 2. 191a.

1,355,1 59, Patented Oct. 12, 1920.

5 SHEETS-SHEET '5- ]afj 314.25

UNITED STATES PATENT OFFICE.

WILLIAM C. MEYER, 015' BEVERLY, MASSACHUSETTS, AssIGNORTC UNITED stron-MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION on NEWJERSEY.

T 0 all whom it may concern:

Be it known that I, WILLIAM G. MEYER, a citizen of the United States,residin at Beverly, in the county of Essex and state of Massachusetts,have invented certain new and useful Improvements in Driving andStopping Mechanisms; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to driving and stopping mechanisms andmore particularly to mechanisms of this character which are adapted foruse on shoe sewing or other high speed machines.

The primary object of the invention is to provide for high speedmachines, a driving and stopping mechanism having an improvedconstruction and mode of operation by which a machine which 'is normallydriven at a relatively high or at varying speeds, may be automaticallyStopped with certaintyv and accuracy at a predetermined point in a cycleof operations without producing undue shock or vibration, or Subjectingthe parts of the machine to excessive Strain. With this object in viewthe invention consists in certain novel and improved constructions,arrangements and combinations of parts hereinafter described andparticularly pointed out in the claims, the advantages of which will beunderstood and appreciated by those skilled in the art.

The features of the invention will be readily understood from theaccompanying drawings illustrating the preferred form of the invention,and the following detailed description of the construction thereinshown.

In the drawings, Figure 1 is a view in side elevation of a machineembodying the invention; Fig. 2 is a plan view of the head of themachine; Fig. 3 is a sectional view taken substantially on the line 3-3of Fig. 2; Fig. 4; is a sectional view taken substantially on the line4=4 of Fig. 2; Fig. 5 is a detail view, in side elevation, illustratingcertain parts of the stopping mechanism, and Fig. 6 is a sectional viewtaken substantially on the line 6-6 of Fig. 2.

In the drawings the invention is illus trated as embodied in a welt andturn Specification of Letters Patent.

DRIVING AND STOPPING MECHANISM.

Patented Oct. 12, 1920. Divided and this application filed October 2,

sewing machine having the same construction as the machine illustratedand described in, applicants pending application, Serial 'No. v95,893,filed May 6, 1916, of which the present application is a division, andthe slow speed driving mechanism and the mechanism for controlling itsoperation are constructed and arranged to reverse the cam shaft instopping the machine, so that the needle is retracted While its hook isempty and is brought to rest in position where it does not interferewith the removal of the shoe. It will be understood, how-, ever, thatthe mechanismillustrated, as well as the invention embodiedtherein, isnot confined in its application to amachine of this character, but maybe used in other machines and in other relations.

Referring to Fig 1 of the drawings, the machine therein illustrated isdriven during the sewing operation through a belt pulley 2 securedto theend of the cam shaft 4' and connected by a driving belt 6 with a pulley8 mounted onxa shaft 10 in the base. of the machine. The pulley 8 isconnected through the beveled gears 12' with a sleeve 14 mounted on adriving shaft 16 and carrying one member 18 of the main driving clutch.The driving shaft 16 carries the other member 20 of the clutch, and alsocarries the driving pulley 22 through which motion is imparted to thedriving shaft. The engagement of the members of the driving clutch iscont-rolled through a treadle 24 connected with the clutch operatingwedge 26. When the treadle is depressed, the members of the drivingclutch are forced into engagement, and the machine is driven at a speeddependent upon the pressure which the operator applies to the treadle.\Vhen the treadle is released the clutch members are disengaged thereby,disconnecting the cam Shaft from the driving shaft.

The upward movement of the treadle when it is released also throws intooperation mechanism which reverses the cycle of operations of the stitchforming mechanism to cast off the thread from the needle, and whichbrings the machine to rest with the parts in proper position for theremoval of the shoe. This mechanism in the construction shown comprisesa friction clutch V in place on the rim 46 with a shoulder 52,

Q ,7 I I l I p 7 1,355,156

which is normally disengaged, but which is engaged upon the release ofthe treadle.

The driving member of the clutchrotates in a direction reverse to thedirection of' rota-- tion ofthe cam shaft of the machine, and when theclutch is engaged, the driving member first acts on the driven member ofthe clutch as a brake to arrest the rotation thereof and of the camshaftto which it is fixed, and then, as a driver to drive the drivenmember and the cam shaft in a reverse direction to stopping position.The driving member 28 of the slow speed clutch (see Figs. 2,3, 5 and 6)is loosely mounted on the cam shaft of the machine and is formed on itsperiphery with spiral teeth 30 meshing with theteeth of a spiral drivingpinion 32 secured toa shaft 84. The shaft 34 is continuously driven fromthe driving pulley by means of a belt 36 passing over a pulley 38 fixedto the outer end of the shaft, and over a pulley 40 formed on thedriving pulley 22. The driven member of the slow speed clutch, indicatedat 42, is carried by a sleeve 44 which isloosely mounted on the hub ofthe driving member 28 of the clutch,

and is free to slide axially thereof to en- 7 gage and disengage theclutch. The clutch members are constructedto secure a particularlyeflicient clutching action when they are engaged, and to obviate allobjectionable sticking of the clutch when the driven member is shiftedto disengage the clutch. 1

The driven clutch member-comprises a rim 46 having an exteriorcone-shaped face and a split clutch ring 48 keyed to the rim and havingan interior cone-shaped face fitting against. the exterior face of therim. The clutch ring 48 is connected to rotate with the rim by key 50mounted in the rim and projecting outwardly therefrom between the endsof the ring. This key is preferably arranged obliquely to the axis ofthe clutch, so that the clutch ring will be given a slight rotarymovement when the rim is moved axially with relation to the ring. Theclutch ring is formed with an exterior clutchface arranged to engage theinterior clutch face of the driving member 28 of the slow speed clutchThe elements of the engaging faces of the rim 46 and the clutch ringhave a greater inclination to the axisof the clutch than the elements ofthe outer or clutch face ofthe ring and the clutch face of the drivingclutch member which it engages. :The clutch ring'is held on the ringengaged with a flange 54 on the rim by a retaining ring 56 having aflange 58 engaging in a groove in the clutch ring. The retaining ring 56is supported by screws 60 passing through perforations in the rim 46-andthreaded into the retaining ring, and the ring 56 is pressed against theclutch ring to holdthe clutch ring in position on the rim 46 by coiledsprings 62 seated in recesses in the rim and acting against the heads ofthe screws. clutch ring in which the flange'58 engages is somewhatwider. than the flange to permit the clutch ring to contract and expandrelative to the retaining ring. This construction enables the drivingand. driven members of the clutch to be formed with their elementsinclined at a much smaller angle to the axis of the clutch than is usualin clutches of this character without causing any objectionable stickingof the clutch when it is disengaged. Withthis construction the clutchrin is normall held in the The groove in the gitudinally of the camshaft to disengage the clutch, if there is any undue friction betweenthe clutch surfaces of the clutch ring and thedriving member of theclutch tending to resist this movement, the rim 46 will-move axially toa slight extent independently of the ring to disengage the outer face ofthe rim from the interior cone face of the ring, this movementof the rimindependently of the ring being permitted by the yielding of the spring62. hen'the outer face of the rim is disengaged from the ring, the ringis permitted to contract slightly so as to relieve the friction be tweenits clutch face and the clutch face of the driving member of the clutchand thus allow the clutch to be readily disengaged. After the clutch isdisengaged, the ring is restored to its normal position on the rim 46 bythe action of the springs 62.

While the sleeve 44 is free to slide on the hub of the driving clutchmember longitudinally of the cam shaft, it is connected to rotate withthe shaft by means of a lug 64 projecting from the pulley 2 and engagingbetween lugs 66 formed on the sleeve.

The sleeve is normally held in position on the hub of the driving clutchmember with the members of the clutch disengaged by a spring 48 seatedin a recess or bore in the pulley 2 and acting against the head of a pin70 passing through the spring and through an opening in the pulley andthreaded into the sleeve 44. 7

When the clutch members 28 and 42 are engaged, they first act on the camshaft as a friction brake to absorb the energy due to momentum, andafter the forward move ment of the cam shaft has ceased, the clutch actsto turn the shaft in a reverse direction at a comparatively slow speeduntil the clutch is disengaged, when the cam shaft is brought to restwith the needle and other parts of the stitch forming mechanism in thepro er position for the removal of the shoe. he mechanism for engagingand disengaging the clutch at the proper times in the rotation of thecam shaft comprises a cam groove 72 formed in the sleeve 14: and engagedby a roll 74 on one arm of a bell crank lever 76. The other-arm of thebell crank lever is provided with a hole 78 adapted to receive a lockingpin 80 which is normally held out of engagement with the lever so that,during the normal running of the machine, the lever is oscillated idlyby the cam. The locking pin is mounted on one end of a. slide 82 whichis held in normal position by a spring 84. The spring surrounds a boltor rod 86 extending from the forward end of the slide, and is interposedbetween a shoulder on the slide and the inner end of an adjustable screwthreaded sleeve 88 surrounding the rod and threaded into the frame ofthe machine. The movement of the slide under the action of the spring 84is limited by the engagement of a stop nut 90 threaded on the forwardend of the rod 86 with the forward face of a bracket 92 on the framethrough which the rod passes. By adjusting the sleeve 88 the tension ofthe spring may be varied, and by adjusting the nut 90 the slide may beadjusted to bring the locking pin into proper position to register withthe hole in the end of the lever 76. The locking pin is forced in adirection to engage its upper end in the opening in the arm of the bellcrank lever by a spring 94, and the lower end of the pin is connectedwith the treadle 241 so that the pin is held down out of engagement withthe bell crank lever as long as the treadle is depressed and the maindriving clutch is engaged to drive the cam shaft of the machine. A latch96 is also connected with the lower end of the locking pin, and isarranged to engage a shoulder 98 on the slide 82 and hold the lockingpin in lowered position during the movements of the treadle imparted bythe operator in varying the speed of the machine at different po1nts 1nthe sewing operation. In the constructlon shown, the latch 96 is looselymounted on a shaft 100 carried in a block 102 secured to the lower endof the locking pin. The hub of the latch is formed with spaced lugs 1041fitting between corresponding lugs 106 on the hub of an arm 108 pivotedon the shaft 100. As will be noted from an inspection of Fig. 3, thelugs 10 1 on the hub of the latch are somewhat narrower than the spacesbetween the lugs 106 on the hub of the arm 108, so that there is acertain amount of lost motion between the arm and the latch when the armis turned about the shaft; The arm 108 is connected b a treadle rod 110with the treadle 24L. W hen the treadle is depressed the arm 108 turnson the shaft 100, and through the engagement of the lugs 106 on the armwith the lugs 104: on the hub of the latch 96, the latch is turned untilit brings up against the slide 82 and then, during the continueddownward movement of. the treadle, the locking pin'is drawn down againstthe tension of its spring. During the downward movement of the lockingpin the latch 96 is depressed until its upper end is carried beneath theshoulder 98 on the slide. During the variations in the positions of thetreadle occurring during the sewing operation for the purpose of varyingthe speed of the machine, the engagement of the latch with the shoulder98 maintains the locking pin out of engagement with the hole in the armof the bell crank .76. When the treadle is released, the latch 96prevents the upward movement of the lockingpin until the lugs 106 on thehub of the arm 108 strike the lugs 104 on the hub of the latch and swingthe latch outward, thus disengaging it from the shoulder 98. Then thistakes place, the spring 94 forces the locking pin upward against theunder side of the bell crank lever, and when the hole in the leverregisters with the pin, the pin snaps upward into the hole, thusconnecting the lever with the slide, 82. I

The cam 72 is so timed that the hole in the end of the arm of the bellcrank lever is brought into position to register with the locking pin atthe proper time in the cycle of operations of the stitch formingmechanism. WVhen the pin is engaged with the hole in the arm of the bellcrank lever, the lever is held from movement about its pivot and the cam72, acting on the roll 74, carried by the lever, shifts the sleeve 44 tobring the members of the slow speed clutch into engagement. When thelever and slide 82 are locked together by the locking pin, the movementof the lever is resisted by the spring 84, and the force with which themembers of the friction clutch are pressed together will depend upon thecompression of the spring. This may be adjusted to se cure the desiredbraking effect between the members of the friction clutch, so that theforward rotation of the cam shaft will be arrested within the desiredpart of a revolution. In theconstruction shown, the parts are so timedand controlled that the looking pin is engaged with the lever, and thefriction clutch engaged, while the needle is retracted, and just beforeit begins its advance movement, and the forward rotation of the camshaft is arrested after the needle has advanced and enters the work. Theclutch then acts to turn the cam shaft in a reverse direction at slowspeed until the shaft arrives at the point where the cam 72 acted toengage the members of the clutch, when the reversely moving cam actsagain to disengage the clutch members. 7

When the, slow speed reversing clutch is disengaged, the reverse,movement of the cam shaft is arrested by a friction brake so as toprevent any accidental over-running of the shaft. In theconstructionshown, this friction brake comprises a pair of brake shoes112 and 114 (see Fig. 4) mounted within the laterally projecting flange116 formed on the pulley 2,- the brake shoes being arranged to engagethe interior surface of the flange. The lower ends of the'brake shoesare connected by a toggle comprising pivotally connected links 118 and120, which toggle is operated to engage the brake shoes with the brakeflange 116v and to disengage the brake, shoes therefrom at the propertimes. Attheir upper ends, the brake shoes are supported and guided uponpins 122 projecting laterally from a block 124 (see Fig. 6). The upperend faces of the brake shoes are held by a spring 126 against aneccentric head 128 formed on a pin or rod 130 passing through an openingin the block 124 and through an opening in the head of a draw bolt 132which engages in. a recess in the block. The draw bolt is mounted in aslot in the frame of the machineand a nut 134 is threaded on the upperend of the bolt. The draw bolt acts to secure the block 124 to the frameand to clamp the pin 130, so as to maintain the brake shoes in adjustedposition. By loosening the nut 134 the pin 130 is unclamped and byapplying a screw driver to the slotted head 128 the pin 130 may beturned to adjust the brake shoes with relation to the brake flange 116.Upon the reversal in the direction of rotation of the cam shaft thebrake shoes are engaged with the brake flange to arrest the reverserotation of the cam shaft after the j disengagement of the driven memberof the slow speed reversing clutch from the driving member. Byillll'lll'lg the eccentric head 128 to adjust the brake shoes, the po vsition in which the cam shaft is finally brought to rest may beregulated or compensation made for wear of the brake sh es and brakeflange. The brake shoes are dis engaged from the brake flange as thetreadle is depressed by the operator to start the machine so that thecam shaft is freed from the action of the brake when the shaft isconnected with the main drivingmechanism and the machine may be startedwithout undue resistance. The mechanism for actuating the toggle toengage the brake shoes with the brake flange comprises a link 136pivotally connected at its upper end with the central joint 138 of thetoggle, a lever .140, a link 142' connecting the rear end of the leverwith the lower end of the link 136, a rod 144 pivotally connected to theforward end of the lever and passing at its upper end through an openingin an arm 146 of a bell crank lever 148, and a spring 150 interposedbetween the arm 146 and a collar 152 held in position by a nut threadedon the rod. The movement of the rod through the opening in the arm 146is limited by a collar 154 mounted on the rod to engage the under sideof the arm. The lever 148 is oscillated by a swinging arm 156 such asisordinarily employed in tension release mechanisms pivotally connectedwith the lower arm 157 of the lever and adapted to with a collar 166clamped von the treadle rod 110 (see Fig. 1) As the rotation of the camshaft is reversed upon stopping the machine the movement of the lever 148, produced by the oscillation of the swin in arm 156 acts through therod 144, to actuate the lever 14() and. depress the link 142 and thelink 136 connected therewith. The downward movement of the link 136tends to straighten the toggle consisting of the links 118 and 120 andthe brake shoes 112 and 114 are engaged with the brake flange 116 by themovement of the toggle. The frictional engagement hetwcen the brakeshoes and the brake flange arrests the rotation of thecam shaft afterthe slow speed reversing clutch is disengaged. Asthe treadle isdepressed to start the machine through the connection between the lever158 and the treadle rod, the lever is swung in a direction to throw thelink 160 toward the rear of the machine. Thi movement of the link 160swings the link 142 about its pivotal connection with the lever 140 andelevates the link 136 to diminish the angle between the toggle links 118and 120 and thereby release the brake shoes from the brake flange. W henthe main driving clutch is engaged to start the machine the cam shaft isentirely freed from the resistance of the brake.

It is understood that the invention is not limited to the particularconstruction of the illustrated embodiment thereof but that it may beembodied in other forms within the.

- ing, in combination, a shaft, driving mechanism for the shaft, andbrake mechanism for the shaft comprising a member having a brake flangeconnected to rotate with the shaft, brake shoes arranged to engage thebrake flange, fixed guiding pins extending through slots in the upperends of the brake shoes, means whereby the upper ends of the brake shoesmay be adjusted with relation to each other and maintained in adjustedposition, and mechanism for actuating the lower ends of the brake shoesto engage them with and to disengage them from the brake flange.

2. Driving and stopping mechanism having, in combination, a shaft,driving mechanism-for the shaft, and brake mechanism for the shaftcomprising a member having a brake flange connected to rotate with theshaft, brake shoes arranged within the brake flange, guides for theupper ends of the brake shoes, a bolt having an eccentric surfaceagainst which the upper ends of the brake shoes rest, means whereby thebolt may be rotatably adjusted to adjust the upper ends of the brakeshoes, means for maintaining the brake shoes in adjusted position, andmeans for separating and bringing together the lower ends of the brakeshoes to engage them with and to disengage them from the brake flange.

3. Driving and stopping mechanism having, in combination, a shaft,driving mechanism for the shaft, means for connecting the shaft with thedriving mechanism and disconnecting it therefrom, and mechanism forfinally arresting the rotation of the shaft, comprising a member havinga brake flange, and connected to rotate with the shaft, brake shoesarranged to engage the brake flange,

'a toggle connecting the lower ends of the brake shoes, and connectionsfor actuating the toggle to cause the brake shoes to engage the brakeflange whenthe shaft is disconnected from the driving mechanism and foractuating the toggle to disengage the brake shoes from the brake flangebefore the shaft is connected with the driving mechanism upon startingthe machine.

4. Driving and stopping mechanism having, in combination, a shaft, highspeed forward and low speed reverse driving mechanism therefor, meansfor connecting the shaft with the driving mechanism and disnecting ittherefrom, a friction brake for stopping the shaft when the reversedriving mechanism is thrown out comprising a member having a brakeflange and connected to rotate with the shaft, brake shoes arranged toengage the brake flange, a toggle connecting the lower ends of the brakeshoes, and connections for actuating the toggle to apply the brake shoesto the brake flange upon the reversal of the direction of rotation ofthe shaft and for actuating the toggle to release the brake shoes fromthe brake flange before the shaft is connected with the high speeddriving mechanism upon starting the machine.

5. Driving and stopping mechanism having, in combination, a shaft, highand low speed driving mechanism therefor, means for connecting the shaftWith the driving mechanism and disconnecting it therefrom,'a frictionbrake for stopping the shaft when the low speed driving mechanism isthrown out comprising a member having a brake flange and connected torotate with the shaft,brake shoes arranged to engage the brake flange, atoggle connecting the lower ends of the brake shoes, and connections foractuating the toggle to apply the brake shoes to the brake flange whilethe shaft is rotating under the influence of the low speed mechanism andto disengage the brake shoes from the brake flange before the shaft isconnected with the high speed mechanism upon starting the machine.

6. Driving and stopping mechanism having, in combination, a shaft,driving mechanism-for the shaft, a treadle for controlling theconnection of the shaft with the driving mechanism, means for finallyarresting the rotation of the shaft, comprising a member having a brakeflange and connected to rotate with the shaft, brake shoes for engagingthe brake flange, a toggle connecting the lower ends of the brake shoes,a toggle actuating member for actuating the toggle to cause the brakeshoes to engage the brake flange when the shaft is disconnected from thedriving mechanism, pivotally connected links of different lengths, aconnection between one of the links and the central joint of the toggle,a connection between the other link and the toggle actuating member, andmeans for swinging the pivotal connection between the links about theconnection between one of the links and the toggle actuating member toactuate the toggle to release the brake shoes from the brake flange uponthe actuation of the treadle to connect the the machine.

WILLIAM C. MEYER.

